you can find IPSC airsoft competition mainly in asia countries like Hong Kong and Taiwan.
here are a few links:
www.hksdu.com
www.hkstcipsc.com
www.airsoftipsc.org
actually i don't compete in any IPSC competition. a friend and myself compete against each other in the basement shooting dominos, cards, and paper targets.
i'm mostly a collector and would like to make the necessary mods so i can get an edge.
Thanks